Transaction not yet indexed

ML18XWxsf3ZYEa1jhuVvc9WDuTMAV2yC5nE5GS1uzN4qEDgj4XWki2PBF7uxXmrLHSSiGztxBtNWUJRCarrBKa6

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.